No audio with Blackmagic video files

Joav-Shdema wrote on 4/25/2022, 5:10 AM

Seems Blackmagic had done something to their video capture setup (Desktop Video 12.0 and above, Windows 10) but the phenomenon happens only in Vegas! (all versions).

On import these files to Vegas you get only the video track without the audio track. Doing the same to Premier, Resolve, WMP - the audio is there. Double clicking the video in Windows - it plays video and audio. Inspecting the file properties in the Windows explorer it states video AND audio tracks (24bit 48000Hz) but inspecting the same file in Vegas it states Video at the correct values and Audio as 00:00:00:00 means no audio/no sync... and it does not play or present itself in the timeline.

Have any of you experienced that?

BTW, importing older files plays well as normal - but only the latest drivers and software support the 4K Declink Card

 

Comments

AmazingM wrote on 4/25/2022, 7:16 AM

Yes I have the same issue. Not been able to work out why....My other NLE's import it (audio) fine..go figure...

DMT3 wrote on 4/25/2022, 7:29 AM

Vegas does not like avi's with anything over 16bit audio. you need to demux or re-render the audio to a wav file. you don't have to change the bitrate, just import the wav file and resync. I have the same problem and this is the besrt workaround I have found.

Joav-Shdema wrote on 4/27/2022, 1:18 AM

Thanks DMT3

I can confirm this now. Run a test with AVI-DV file (16/48) and Vegas imports and plays audio perfectly, then imported an AVI file at 24/48 and the audio track went missing.

Will send a ticket to Vegas and Blackmagic - since I do not see them follow this here...

VEGASHeman wrote on 4/27/2022, 11:01 AM

@Joav-Shdema: Would it be possible for you to upload a small sample file which exhibits this problem?

Joav-Shdema wrote on 4/28/2022, 10:59 AM

@VEGASHeman

Sure

Here is a link for 2 very short video files at 24 and 16 bit audio

https://drive.google.com/drive/folders/1kTYOgd385u1cG1gT-QgWwxqcpR4sGpHZ?usp=sharing

john_dennis wrote on 4/28/2022, 12:28 PM

@Joav-Shdema @AmazingM

Vegas Pro 19-550 doesn't have a problem with 24 bit audio, just not the way it's wrapped in your file. As a workaround, until @VEGASHeman responds, you could use the Shutter Encoder to extract the 24 bit audio files and add them to the Vegas Pro timeline as separate files. They can then be grouped with the video if you chose.

Your 24 Bit File

General
Complete name                            : C:\Users\John\Desktop\VEGAS VIDEO TEST\24 BIT.avi
Format                                   : AVI
Format/Info                              : Audio Video Interleave
File size                                : 214 MiB
Duration                                 : 10 s 560 ms
Overall bit rate                         : 170 Mb/s

Video
ID                                       : 0
Format                                   : YUV
Codec ID                                 : UYVY
Codec ID/Info                            : Uncompressed 16bpp. YUV 4:2:2 (Y sample at every pixel, U and V sampled at every second pixel horizontally on each line). A macropixel contains 2 pixels in 1 u_int32.
Duration                                 : 10 s 560 ms
Bit rate                                 : 166 Mb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 5:4
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Compression mode                         : Lossless
Bits/(Pixel*Frame)                       : 16.000
Time code of first frame                 : 00:00:00:00 / 00:00:00:00
Time code source                         : Adobe tc_A / Adobe tc_O
Stream size                              : 209 MiB (98%)

Audio
ID                                       : 1
Format                                   : PCM
Format settings                          : Little / Signed
Codec ID                                 : 00000001-0000-0010-8000-00AA00389B71
Duration                                 : 10 s 560 ms
Bit rate mode                            : Constant
Bit rate                                 : 2 304 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Bit depth                                : 24 bits
Stream size                              : 2.90 MiB (1%)
Alignment                                : Aligned on interleaves
Interleave, duration                     : 960  ms (24.00 video frames)

Sutter Encoder Extracted Audio File

General
Complete name                            : C:\Users\John\Desktop\VEGAS VIDEO TEST\24 BIT_Audio_1.wav
Format                                   : Wave
File size                                : 2.90 MiB
Duration                                 : 10 s 560 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 2 304 kb/s
Writing application                      : Lavf59.5.100

Audio
Format                                   : PCM
Format settings                          : Little / Signed
Codec ID                                 : 00000001-0000-0010-8000-00AA00389B71
Duration                                 : 10 s 560 ms
Bit rate mode                            : Constant
Bit rate                                 : 2 304 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Bit depth                                : 24 bits
Stream size                              : 2.90 MiB (100%)

 

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VEGASHeman wrote on 4/28/2022, 4:22 PM

@Joav-Shdema: Thanks, I was able to download the files and confirm the problem with the 24-bit file. The problem with the 24-bit file is related to an unrecognized audio codec id, even though we do handle 24-bit PCMs in AVI files.

Via MediaInfo:

24-bit file: Codec ID: 00000001-0000-0010-8000-00AA00389B71

16-bit file: Codec ID: 1

We may be able to change the code to open it up for handling more such files natively - a quick test seems to reveal no issues with the file you uploaded once I open up the id check. But we need to some more checking to ensure the safety of such a change. I will keep you posted on how it goes.

Thanks for bringing this to our attention.

Joav-Shdema wrote on 4/29/2022, 3:38 AM

I will keep you posted on how it goes.

Double thumbs up!

AmazingM wrote on 4/29/2022, 3:40 AM

Thanks Joav-Shdema for bringing this issue up in the forum and john_dennis and VEGASHeman for your help and time in this matter too :-)

Joav-Shdema wrote on 4/29/2022, 3:44 AM

Thanks john_dennis and VEGASHeman for your help and time in this matter :-)

Absolutely! With the workaround from @john_dennis and the team effort now in work with @VEGASHeman I feel safe

VEGASHeman wrote on 5/5/2022, 11:07 AM

Update: we have done the necessary due diligence and can now safely support this file with the proposed changes - please expect this in the next update.

AmazingM wrote on 5/8/2022, 1:31 AM

Thank you to the amazing Vegas Pro team. Looking forward to the next update😃